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Senedra Forest Ruins Ancient Mechanism Door Puzzle

By
Matt Chard
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In Hell is Us, you will come across a lot of difficult puzzles, some of which can’t be opened until much later in the game. These puzzles will require you to follow and read the in-game notes (or the use of Google) to get through them. One of the first puzzles you’ll come across is the one in the ruins of Senedra Forest, next to the APC. Read on to find out how to figure out the puzzle and what the correct answer is.

In Senedra Forest, you’ll come across an Ancient Ruin that requires you to solve a puzzle to enter it. Read on to find the answer.

Table of Contents

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How to Leave the Caddell Farm

Before you get to the main part of Senedra Forest, you’ll need to access it. When you first visit the area, the first place you’ll come to is Caddell Farm. In the basement is Ernest Cadell, sitting in the dimly lit room. Speak to him, and he’ll give you the Key - Caddell Farm. Exit the basement and head over to the gate, and use the Key you just got to gain access to the forest.

Speak with Ernest Caddell in the basement of the farmhouse for the key to open the gate.

Use the key to open the gate to the forest.

Finding the Ancient Ruin

After opening the gate, follow the Wind Chimes hanging off the trees, and they’ll eventually take you to the ruins. Outside the ruins is an APC, an injured soldier, and the Ancient Ruin. Before you can solve the puzzle, you’ll need a Key, and the wounded soldier just happens to have it. However, he won’t give it to you until you help him with his wounds. To do this, you’ll need to find a Med Kit for him.

When you leave the farm, follow the wind chimes to find the ruin.

You’ll know you’re in the right place when you find the APC.

MedKit Location - X Marks the Spot!

The wounded soldier will mention to you that he has a med kit in a camp in the woods to the west and that they marked the trees with an X so that it would be easy to find if they got lost. After you’re done talking to him, go west and take the upper path, and just before the path turns to the right, you’ll find the first tree with an X on it. Follow the path around to the right, and as you turn to the left, you’ll find the second tree with an X on your right.

As you turn the corner, you’ll have a choice: go left or straight on. Left will lead to a note called Caddell Treasure Hint, unlocking the Caddell Family Treasure Mystery, but straightforward is the correct way to go. As you go straight, you’ll find the third tree marked with an X to your left. Head straight a short way to reach an intersection. If you look at the tree at the back to the right, you’ll find the fourth X-marked tree, indicating the correct way to go.

(1 of 3) Follow the X’s marked on the trees to find the Medkit.

Take a right at the intersection and then immediately go left to find an open area. Look at the trees at the back to the southwest (use the compass) and you’ll find the fifth X-marked tree. Go toward it and turn right when you can to find the sixth tree with an X on it on your right. Continue and you’ll find the final X, but this time it’ll be on a blue metal drum ahead of you.

(1 of 3) After taking the right path at the intersection, go left to find an open area. At the back to the southwest is a tree with an X on it.

Finally, take a right at the blue drum, and look to your right to find a tent next to the generator. At the front of the tent, on the left-hand side, you’ll find the OMSIF MEDKIT, which is what you need for the soldier. Make your way back to the soldier going back the way you came (the trees will have an X on them), or continue exploring the forest to complete the Caddell Family Treasure Mystery.

Look to the right of the generator for a tent.

The Medkit will be near the entrance of the tent, on your left.

Ancient Mechanism Puzzle Answer

Hand over the MedKit to the soldier, and he’ll give you the Ancient Mechanism, which is what you need to open the door to the ruins. Behind the soldier is a ladder against the wall. Climb up it and the following ladder, and then follow the path around to the left. Here, you’ll find a pedestal. Interact with it and place the Ancient Mechanism into it to release three more pedestals that you can rotate.

(1 of 4) Hand over the Medkit to the soldier.

To figure out this puzzle, go past the third pedestal into the room on your left. At the back is a plaque with the Crown and Eye symbols, but the final part of the plaque is broken. Return to the top of the ladder and you’ll find the other piece of the plaque against the wall to your left, which displays a Pickaxe. Go back to the pedestals and, starting from nearest to furthest, rotate them to display a Crown - Eye - Pickaxe, in that order. This will open the door to the ruins, next to the soldier and APC.

(1 of 3) For the puzzle, head behind the last pedestal and go left to find a broken plaque. The first two symbols are here.

That’s it for this puzzle, but there are many, many more, some of which you’ll need to come back to, to complete them.

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Guide Information
  • Guide Release
    31 August 2025
  • Last Updated
    4 September 2025
    Version History
  • Guide Author

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No map. No quest markers. No magical compass. Follow your instincts.

If war is the closest we get to hell on earth, it’s because Earth harbours the worst of demons: humankind. In an isolated country ravaged by infighting, discover the secrets of your past and deal with the repercussions of a mysterious calamity. The guide for Hell is Us will contain the following:

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